| Notation | Description |
| M | The elderly evaluation model |
| A | The collection of the evaluation items |
| V | The collection of all possible values for each evaluation item |
| U | The collection of elderly evaluation result |
| I | The evaluation information system for elderly |
| IND(A) | The indiscernibility relation on A |
| EC(A) | The collection of equivalence classes of A |
| D | The collection of Decision Attribute |
| D-Table(D) | The Decision table of Decision Attribute collection D |
| ec-d(D) | The decision equivalence class in each row in the D-Table(D) |
| r | The decision rules from the decision equivalence class ec-d(D) |